Titanium is the first member of the 3d transition
series and has four valence electrons, 3d24s2.
The most stable and most common oxidation state is +4; however, compounds
in a range of lower oxidation states, -I, 0, II, III, are also known, although
thery are readily oxidized to TiIV by air, water, or other reagents.
The other group 4 metals include Zirconium, Hafnium and Unnilquadium.
The metals are poor conductors of heat and electricitycompared with most
othe metals.